Saturday, April4, 2020
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Marine Weather and Tides
Felida, WA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:41AMSunset 7:44PM Saturday April 4, 2020 7:31 PM PDT (02:31 UTC) Moonrise 2:30PMMoonset 4:23AM Illumination 91% Phase: Waxing Gibbous; Moon at 12 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ210 Columbia River Bar- 205 Pm Pdt Sat Apr 4 2020
In the main channel.. - general seas...2 to 3 ft today through Sun. - first ebb...around 245 pm Sat, with seas near 5 ft. - second ebb...around 330 am Sun, with seas near 6 ft. - third ebb...strong ebb around 345 pm Sun, with seas near 8 ft.
PZZ200 205 Pm Pdt Sat Apr 4 2020
Synopsis for the southern washington and northern oregon coast.. Weak low pressure will move into the waters through Sunday afternoon. Thermal trough builds near oregon california border Tuesday. High pressure strengthens offshore through the middle of the next week.


7 Day Forecast for Marine Location Near Felida, WA
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location: 45.73, -122.75     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 042357 AAA AFDPQR

Area Forecast Discussion . Updated National Weather Service Portland OR 455 PM PDT Sat Apr 4 2020

SYNOPSIS. A couple of upper lows will maintain cloudy weather with a chance for showers through at least Sunday night. Instability will increase in the afternoons for a slight chance of afternoon thunderstorms over the Oregon Cascades. An upper ridge of high pressure builds over the pacific NW Monday and Tuesday and holds through at least Thursday for dry weather and gradually warmer daytime temperatures.

UPDATE. Made some quick updates to the forecast for tonight, as it appears the northward-spreading rain band is holding together a little better than most models suggested. The 4km NAM Nest model has seemed to handle this situation best, so trended PoPs/QPF toward what the 18z NAM Nest suggested. This will bring a slushy inch or two of snow to the Cascade passes. Strong April solar energy has kept the passes mostly wet this afternoon, but high elevation roads will likely become more icy and slick as this evening progresses. The shortwave responsible for this band of rain will continue to lift northward the next few hours, splitting apart as it moves into Washington. Precip will be less likely for our northern zones later tonight, while additional precip bands associated with low pres over SW Oregon keep a decent chance of rain and Cascades snow for Lane County into Sunday morning. Weagle

SHORT TERM. Today through Tuesday . A low offshore southern Oregon is slowly moving east this afternoon. So far, most of the rain with this system has been across across northern California and south Oregon. Light rain has been observed in parts of NW Oregon, but the rain chances will become more widespread across NW Oregon and into SW Washington this afternoon and evening as the low moves east and north across NW Oregon. There has not been much signs of convection on satellite imagery yet, but models are fairly consistent on forecasting marginal instability across the south Oregon Cascades later this afternoon which may extend into the southern portion of the Lane County Cascades.

Water vapor imagery shows another upper low around 330 miles offshore the Washington coast. This low will move south remaining offshore tonight to just offshore the Oregon/California border early Sunday morning then move inland across Oregon Sunday afternoon. This low will continue the threat for showers for the area tonight and Sunday and provide another possibility for afternoon thunderstorms across the Oregon Cascades Sunday afternoon. South to southwest 0 to 6 km AGL streamlines suggest that any thunderstorms that may form across the south and central Oregon Cascades may drift north to northwest for a slight chance of thunderstorms along the central Oregon Cascade foothills. Do not think the thunderstorms will last long enough to impact much of the Willamette Valley though due to the lack of surface-based instability across the lowlands. However, if there is clearing in the Willamette Valley late in the morning or early afternoon, it may improve the chances.

Showers will continue but decrease from the north to south Sunday night and Monday as an upper ridge begins to squeeze in between the upper low over northern CA and an upper trough over the British Columbia. The upper ridge builds over the Pacific NW Monday night and Tuesday pushing the Californian low further south. Models hint that the upper high may settle in north of the upper low into a rex blocking pattern by Tuesday afternoon. ~TJ

LONG TERM. Tuesday night through Saturday . Models and ensembles forecast a rex blocking pattern starting the long term forecast with an upper ridge of high pressure over the Pacific NW and an upper low over southern California. This will result in at least a few days of dry weather with daytime temperatures gradually warming. Models currently forecast Thursday to be the warmest day of the week with afternoon temperatures peaking at or just below 70 degrees in the interior low lands. Light onshore flow will maintain near normal temperatures along the coast though with afternoon temperatures along the coast peaking at or just below 60 degrees.

Uncertainty begins to creep into the forecast Friday as some of the models forecast the southern upper low will move inland and an upper trough over the Gulf of Alaska flattening the upper ridge. Models have a tendency to forecast the breakdown of blocking patterns too quickly, and expect that the upper pressure pattern will take a little longer to change, and that dry weather will persist another 1 or 2 days. Regardless, PoPs are reintroduced to the forecast beginning Friday night with daytime temperatures gradually cooling Friday into next weekend. It is worth mentioning that if the upper ridge persists Friday into Saturday, that the afternoon temperatures may possibly be warmer on Friday as opposed to cooler. ~TJ

AVIATION. Satellite is showing the low pressure to the southwest moving very slowly and tracking slightly east, northeast. Light rain is moving up from the south with scattered and broken cloud decks around 1500 ft. Ceilings are expected to stay in MVFR criteria for sites south of a KONP to KSLE line. Visibility in KONP will likely deteriorate to 4SM around 00Z Sun as drizzle continues. Sites north of this line should expect a mix of VFR to MVFR conditions through roughly 08Z to 12Z Sun. KAST will likely see VFR through the TAF period. Light offshore winds through this evening turning to a more northerly pattern by end of day Sunday. VFR to reestablish across the CWA by 18Z.

PDX AND APPROACHES . Increasing clouds aloft through this evening as the warm sector of a low pressure to the southwest brings moisture north. Ceilings will periodically drop to high-end MVFR through 12Z. Light rain is expected between 03Z to 08Z. VFR to reestablish between 12 to 15Z Sun. -BPhillips

MARINE. Low pressure to the southwest will continue through this evening. It is slowly losing energy as it sits off the southern Oregon coast reducing chances of strong winds through tonight. There is some disagreement between the hi-res models on exactly where low will track but all solutions show relatively weak winds over the northern and central Oregon waters. Possibility of stronger gusts around 21 kt near 60nm late tonight into tomorrow morning.

Weak thermal trough will build Monday afternoon and rebuild with greater intensity Tuesday afternoon. Chance for SCA winds during this time for the central waters is likely. High pressure builds well offshore during this time which will keep northerly winds through next week.

Seas will build slightly as offshore winds turn more northerly. Wave heights will trend between 5 to 7 ft through the week. -BPhillips

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . None.

Interact with us via social media: www.facebook.com/NWSPortland www.twitter.com/NWSPortland

This discussion is for Northwest oregon and Southwest Washington from the Cascade crest to 60 nm offshore. This area is commonly referred to as the forecast area.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 28 mi49 min 47°F1002.8 hPa
ASTO3 - 9439040 - Astoria, OR 63 mi49 min S 5.1 G 8 47°F 49°F1002.6 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi43 min 50°F1003.2 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR7 mi38 minN 010.00 miLight Rain48°F39°F74%1002.7 hPa
Pearson Airfield, WA9 mi38 minSE 510.00 miLight Rain48°F39°F74%1002.7 hPa
Portland, Portland International Airport, OR11 mi38 minSSW 610.00 miLight Rain48°F42°F80%1002.8 hPa
Portland-Hillsboro Airport, OR17 mi38 minW 36.00 miLight Rain Fog/Mist44°F41°F89%1003 hPa
Portland, Portland-Troutdale Airport, OR22 mi38 minESE 610.00 miLight Rain49°F37°F66%1002.7 hPa

Link to 5 minute data for KSPB

Wind History from SPB (wind in knots)
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Last 24hrNW5NW4W3W3W3NW4W3N3CalmCalmNW3CalmCalm3N5CalmN3E5S7SE7E5W3CalmCalm
1 day ago3N4W4CalmCalmW3W3CalmW3W3CalmW3CalmCalm3SE5SE10SE12SW5NW5S3SE5NE3E3
2 days agoW4CalmCalmSW3CalmCalmCalmW3CalmCalmCalmCalmCalmCalmSE3SE4SE4SE6NW7--E3----SE5

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Sat -- 12:24 AM PDT     -0.04 feet Low Tide
Sat -- 04:59 AM PDT     1.33 feet High Tide
Sat -- 05:22 AM PDT     Moonset
Sat -- 06:44 AM PDT     Sunrise
Sat -- 07:55 AM PDT     1.06 feet Low Tide
Sat -- 09:14 AM PDT     1.09 feet High Tide
Sat -- 12:41 PM PDT     0.56 feet Low Tide
Sat -- 03:29 PM PDT     Moonrise
Sat -- 04:47 PM PDT     1.71 feet High Tide
Sat -- 07:43 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-000.40.81.21.31.21.11.11.110.90.60.60.81.21.61.71.51.20.90.80.70.4

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
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Sat -- 05:27 AM PDT     Moonset
Sat -- 06:01 AM PDT     2.43 feet Low Tide
Sat -- 06:47 AM PDT     Sunrise
Sat -- 11:21 AM PDT     7.72 feet High Tide
Sat -- 03:32 PM PDT     Moonrise
Sat -- 06:48 PM PDT     -0.09 feet Low Tide
Sat -- 07:47 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.86.45.64.53.52.72.42.94.15.66.97.77.66.85.43.82.310.2-0.10.62.145.8

Weather Map
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wmap_P
GEOS Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Portland, OR (22,6,7,8)
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Ground Weather Radar Station Portland, OR
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.